>>2174874just get a solar cooker/boiler anon, you hauling fuel takes more calories than you get from cooking/campfires. solar cook your eggs/meat/fish/potatoes/rice/beans, boil your water, and almost all solar cookers double as thermoses for keeping shit hot. Get a minigas tank, and not those disposible tiny green tanks for gas, you will have more gas, less trash, and you can cook/boil shit with much less space/weight wasted. Tablets are good for backup/firestarting in wet weather, if you have a large amount of theme for cheap like
>>2175420said, they are pound fro pound the highest value for heat generation, you will have to use two or more and use a proper heat reflector stove with them to actually cook/boil water. And unlike all other fuel based options, you won't be breaking your back hauling them, having to carry empty tanks when you use the up, and can even burn the packaging they come in in most cases.